Class: Rbkb::Cli::Slice

Inherits:
Executable show all
Defined in:
lib/rbkb/cli/slice.rb

Overview

Copyright 2009 emonti at matasano.com See README.rdoc for license information

Returns a slice from input. This is just a shell interface to a String.slice operation.

Instance Attribute Summary

Attributes inherited from Executable

#argv, #exit_status, #oparse, #opts, #stderr, #stdin, #stdout

Instance Method Summary collapse

Methods inherited from Executable

#bail, #bail_args, #exit, run

Constructor Details

#initialize(*args) ⇒ Slice

Returns a new instance of Slice.



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# File 'lib/rbkb/cli/slice.rb', line 9

def initialize(*args)
  super(*args)
  @opts[:last] ||= -1
end

Instance Method Details

#go(*args) ⇒ Object 



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# File 'lib/rbkb/cli/slice.rb', line 35

def go(*args)
  super(*args)
  @stdout << @opts[:indat][ @opts[:first]..@opts[:last] ]
  self.exit(0)
end

#make_parser ⇒ Object 



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# File 'lib/rbkb/cli/slice.rb', line 14

def make_parser
  super()
  add_std_file_opt(:indat)
  add_range_opts(:first, :last)
  arg = @oparse

  arg.banner += ' start (no args when using -r or -x)'
end

#parse(*args) ⇒ Object 



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# File 'lib/rbkb/cli/slice.rb', line 23

def parse(*args)
  super(*args)
  @opts[:first] ||= @argv.shift

  bail_args 'invalid start length' unless @opts[:first].is_a?(Numeric) or /^-?\d+$/.match(@opts[:first])

  parse_catchall

  @opts[:first] = @opts[:first].to_i
  @opts[:indat] ||= @stdin.read
end